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Finding the Fourth Proportional to 140.02, 209.68 and 99.25

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Solution

The fourth proportional to 140.02, 209.68 and 99.25 is: 148.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.02 : 209.68 = 99.25 : x
  2. Step 2: Convert to fraction form
    140.02/209.68 = 99.25/x
  3. Step 3: Cross multiply
    140.02x = 209.68 × 99.25
  4. Step 4: Simplify right side
    140.02x = 20,810.74
  5. Step 5: Solve for x
    x = 20,810.74/140.02
  6. Step 6: Final answer
    x = 148.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.